Statement Of Comprehensive Income [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||
| Profit (loss) |
–
GBP
|
7 5.6
GBP
|
–
GBP
|
79. 6
GBP
|
700,000
GBP
|
80,300,000
GBP
|
75,600,000
GBP
|
4 .0
GBP
|
54,700,000
GBP
|
4,300,000
GBP
|
300,000
GBP
|
–
GBP
|
–
GBP
|
5 0 .1
GBP
|
54,400,000
GBP
|
5 0 .1
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, gains (losses) from investments in equity instruments | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
1. 7
GBP
|
— |
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans | — | — | — |
5,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7. 2
GBP
|
— |
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, net of tax | — | — | — |
13,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
500,000
GBP
|
— |
| Other comprehensive income |
–
GBP
|
2,400,000
GBP
|
7. 9
GBP
|
2,400,000
GBP
|
— | — |
5,500,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
2,700,000
GBP
|
–
GBP
|
2,800,000
GBP
|
2,800,000
GBP
|
5,500,000
GBP
|
| Comprehensive income |
–
GBP
|
7 8.0
GBP
|
7. 9
GBP
|
82,000,000
GBP
|
— | — |
70,100,000
GBP
|
4 .0
GBP
|
— |
4,300,000
GBP
|
— |
2,700,000
GBP
|
–
GBP
|
52,900,000
GBP
|
5 7. 2
GBP
|
55,600,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
78 .0
GBP
|
— | — | — | — | — | — | — | — | — | — |
52,900,000
GBP
|
— |
| Comprehensive income, attributable to non-controlling interests | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,300,000
GBP
|
— |